rhubarb has rust-like spots on the leaves and some leaves are dying
plant has 'rust'. Rust develops over several days of humid mist
or rain. Once established, it is hard to eliminate.
Remove and destroy infected
leaves, then spray with a suitable fungicide such as Bravo. Repeat
sprays at 10-14 day intervals will be required, especially in humid
wet weather. Bravo has a withholding period of 7 days do
not harvest until 7 days after spraying.
by Dr Dan Blanchon from Unitec's Diploma in Sustainable Horticulture and Bachelor
of Resource Management.
with permission from NZOOM Home and Garden content,
from the previous
The views expressed here are not necessarily those of the RNZIH